PART I ΑΝ ELEMENTARY ARITHMETIC BY JOHN H. WALSH ASSOCIATE SUPERINTENDENT OF PUBLIC INSTRUCTION, BOSTON, U.S.A. D. C. HEATH & CO., PUBLISHERS |
PART I ΑΝ ELEMENTARY ARITHMETIC BY JOHN H. WALSH ASSOCIATE SUPERINTENDENT OF PUBLIC INSTRUCTION, BOSTON, U.S.A. D. C. HEATH & CO., PUBLISHERS |